Fix duplicate block bug #10735
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Fix duplicate block bug #10735
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nholland94
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Fixes bug reported in #10717.
The transition frontier would crash if a diff was applied to it which adds a breadcrumb that already exists in the frontier. If 2 block producing nodes are running with the same keypair, and generate the same staged ledger diff when producing their block, then this issue can happen. The fix is to just log a message instead of crashing.